機器
assembly
builder
business
check
circuit
construction
control
current
diesel engines
electric
electrical
electrician
electricity
energy
engineer
engineering
equipment
factory
generator
hand
industrial
industry
installation
labor
machinery
maintenance
man
manufacturing
metal
panel
people
person
plant
power
production
repair
safety
services
system
technician
technology
test
tool
transportation
voltage
work
worker
working